I'm not sure if its an active topic anymore, but I'd like to add my thought to this...
As I dont play with USN much, I did not notice this before, but today I tried F6F-5 hellcat because I found a nice catface skin for it... BUT... Its really weak and slow as you all wrote here!
My opinion is not too good about US planes, particularly P-51 and Hellcat as their historical reputation and effectiveness is very often overrated as technical perfomance not as a combined factor including pilot training, numerical advantages, reliability and tactical employment.
Most of these are not subjects to a flight simulator, so at first I thought that this difference is because the game "evens out" pilot training, flight tactics and other factors, relying only on technical parameters and pure flight model...
I tried out, but when dogfighting, F6F-3 and 5 are both sitting ducks to even a M3 zero. Horizontal maximum flying speed at 1000meter were
M2 Zero 430kmh,
M3 Zero 450kmh
F6F-3 470Kmh... ?? Without bombs of course. it would be ok, but the acceleration is also awful, I ended up 150-200 after each turn.
F4U1 corsair: 525kmh ... I dont know how much it should be... In a dive from 3000 to 2000 I could reach 700, and keep is up for some time but the acceleration and climb is awful.
Its ok, I'm not a good pilot. My controls are also poor. Sometimes I feel the AI climbs better even in the same plane. OK, so I changed sides to try out, an M3 Zero against a pair of F5 hellcats... I could literally fly circles around them. I also seen them stalling very often (white stripes at wing edges). So, I think something is bad, or just went wrong...